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Old 01-13-2014, 04:54 PM   #1
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Roof rebuild

I have a 1998 Jayco Designer 3120 FKS and I need to replace the roof. I know I will need some new rafters, and plywood. I don't know what thickness plywood to get. I pulled back one piece to see what it was and it looks like 2 layers on top of the truss, 1 st layer 5/8 and top layer that the rubber lays on is 3/8. Is this correct or has a previous owner just laid the 3/8 over the 5/8. I want to do it right while I have every thing off.
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Old 01-13-2014, 05:43 PM   #2
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Good question....., but I had a roof rebuild on my '05' several years ago and recall that there was only one layer of plywood.

If a JOF member can't confirm, I would contact Jayco directly.

Bob
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Old 01-13-2014, 09:19 PM   #3
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Seems odd that Jayco would have two layers of plywood. I would call Jayco up with your VIN number ask about the roof construction and ask if they can send you the build drawings. If they still have the drawings they will send them on.
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Old 01-13-2014, 10:14 PM   #4
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Currently Jayco is using 3/8 plywood roof decking.

5/8 for the flooring

Seems odd to have 2 layers of roof decking, especially in an industry driven by weight and price.
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Old 01-14-2014, 06:45 AM   #5
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If the roof was not level, or there was roof work in the past, standard procedure is to put a new thin layer of plywood over the old to make it level before the rubber roof is put on.

I can look up the specs at work in a few.
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Old 01-14-2014, 07:41 AM   #6
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Thanks for the quick replies. John that would be great if you could look that up, and let me know exactly what I need. It is a 1998 Jayco Designer 3210 FKS
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Old 01-14-2014, 09:24 AM   #7
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Parts search comes up with 5/8 only, but.. From the original print, it looks like there is a 3/16 lauan board first, then set back (for the aluminum) is another 1/8 topper. Jayco could have beefed it up on the line, while under production for a heavier duty roof. Or.. could be the interior lauan board for the ceiling.. That would make more sense..

After my ramblings.. it should be only 1 layer of wood. I would go with 5/8 for strength, but you can go 3/8 for ease of work, depending on the distance of the supports.
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Old 01-14-2014, 10:35 AM   #8
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Thanks John. Is there some place I could download these.
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Old 01-14-2014, 11:20 AM   #9
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You can download the one here.. and Jayco has the drawings they can email (i had them email me this one)
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Old 01-15-2014, 07:53 AM   #10
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But.. if you run into problems.. shoot me a line.. I can get them if Jayco wont give them to you.
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